Re: [Xen-devel] [PATCH 3/3] x86_64: allow more vCPU-s per guest

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 18/06/2009 11:22, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>>> Is it safe do you think to go from d->max_vcpus=0 to d->max_vcpus!=0 on a
>>>> live domain? (i.e, the specific case we do use in your general observation
>>>> that increasing d->max_vcpus may be dangerous)?
>>> 
>>> Yes, this is safe imo.
>> 
>> Can you give an example where increasing max_vcpus from X!=0 to Y>X might be
>> dangerous?
> 
> I didn't keep any record, so I'll have to see if I can spot the place(s) again
> (if any - I only vaguely remember possibly having noticed some problem in
> the past). Oh, maybe it was just that the Linux kernel can't deal with it.
> I'll
> look around in any case and let you know.

Fair enough. Anyhow, making the domctl singleshot for now is fine by me,
since we have no usage scenario that requires greater flexibility than that.

 -- Keir



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